jQuery unique array function applied to an array of objects

Question

I am trying to apply the jQuery $.unique() function to an array of objects. I enjoy using this function with an array of primative variables but apparently it doesn't work with objects, as seen here: http://jsfiddle.net/abs10gxo/

var arr1 = [ 
    "aaa",
    "bbb",
    "aaa" 
];

console.log($.unique(arr1));  // Works as expected.

var arr2 = [ 
    { "a": "aaa" }, 
    { "b": "bbb" }, 
    { "a": "aaa" } 
];

console.log($.unique(arr2));  // Doesn't work as expected.

I can't seem to find any literature on jQuery.com in regard to using this function with an array of objects; it only adheres to primative types. Can anyone recommend a solution? Library or custom are both welcome answers. I am familiar with doing this in C++ where you can overload the comparative == sign operator but not sure if that is the best approach since I am using jQuery.